Electronic aerosol provision system

ABSTRACT

A method of generating aerosol from an aerosol generating article which includes portions of aerosol generating material having different compositions from one another. The method includes heating a first aerosol generating material including a first constituent to generate aerosol from the first aerosol generating material; heating a second aerosol generating material including a second constituent different from the first constituent to generate aerosol from the second aerosol generating material, wherein heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time.

The present application is a National Phase entry of PCT Application No. PCT/EP2020/083779, filed Nov. 27, 2020, which claims priority from GB Patent Application No. 1917463.0, filed Nov. 29, 2019, which is hereby fully incorporated herein by reference.

FIELD

The present disclosure relates to non-combustible aerosol provision systems.

BACKGROUND

Electronic aerosol provision systems such as electronic cigarettes (e-cigarettes) generally contain a reservoir of a source liquid containing a formulation, typically including nicotine, from which an aerosol is generated, e.g. through heat vaporization. An aerosol source for an aerosol provision system may thus comprise a heater having a heating element arranged to receive source liquid from the reservoir, for example through wicking/capillary action. While a user inhales on the device, electrical power is supplied to the heating element to vaporize source liquid in the vicinity of the heating element to generate an aerosol for inhalation by the user. Such devices are usually provided with one or more air inlet holes located away from a mouthpiece end of the system. When a user sucks on a mouthpiece connected to the mouthpiece end of the system, air is drawn in through the inlet holes and past the aerosol source. There is a flow path connecting between the aerosol source and an opening in the mouthpiece so that air drawn past the aerosol source continues along the flow path to the mouthpiece opening, carrying some of the aerosol from the aerosol source with it. The aerosol-carrying air exits the aerosol provision system through the mouthpiece opening for inhalation by the user.

Other aerosol provision devices generate aerosol from a solid material, such as tobacco or a tobacco derivative. Such devices operate in a broadly similar manner to the liquid-based systems described above, in that the solid tobacco material is heated to a vaporization temperature to generate an aerosol which is subsequently inhaled by a user.

Most conventional aerosol provision systems tend to offer only minimal customizability in the aerosol that is delivered to a user, primarily changing only the amount that is delivered. Some systems which offer more customizability tend to be larger, e.g., some liquid systems use a plurality of tanks containing different e-liquids which can be selectively heated to generate aerosol.

Various approaches are described which seek to help address some of these issues.

SUMMARY

According to a first aspect of certain embodiments there is provided a method of generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the method comprising: heating a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material; heating a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material, wherein heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time.

According to a second aspect of certain embodiments there is provided an aerosol provision device for generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the device comprising: a plurality of heating elements; and control circuitry configured to implement the method described in the first aspect of certain embodiments.

According to a third aspect of certain embodiments there is provided an aerosol generating system comprising an aerosol generating device according to the second aspect, and an aerosol generating article comprising a first aerosol generating material comprising a first constituent and a second aerosol generating material comprising a second constituent.

According to a fourth aspect of certain embodiments there is provided an aerosol provision means for generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the means comprising: a plurality of heating means; and control means configured to: cause heating of a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material; cause heating of a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material, wherein heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time.

It will be appreciated that features and aspects of the disclosure described above in relation to the first and other aspects of the disclosure are equally applicable to, and may be combined with, embodiments of the disclosure according to other aspects of the disclosure as appropriate, and not just in the specific combinations described above.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 is a cross-section of a schematic representation of an aerosol provision system comprising an aerosol provision device and an aerosol generating article, the device comprising a plurality of heating elements and the article comprising a plurality of portions of aerosol generating material;

FIGS. 2A to 2C are a variety of views from different angles of the aerosol provision article of FIG. 1 ;

FIG. 3 is cross-sectional, top-down view of the heating elements of the aerosol provision device of FIG. 1 ;

FIG. 4 is an exemplary method for generating aerosol from the aerosol provision device of FIG. 1 , wherein selected heating elements are simultaneously activated;

FIG. 5 is a top-down view of an exemplary touch sensitive panel for operating various functions of the aerosol provision system;

FIG. 6 is an series of graphs showing control signals for activating a plurality of heating elements corresponding to different aerosol generating materials;

FIG. 7 is an example of a cross-section of a schematic representation of an aerosol provision system comprising an aerosol provision device and an aerosol generating article, the device comprising a plurality of induction work coils and the article comprising a plurality of portions of aerosol generating material and corresponding susceptor portions; and

FIGS. 8A to 8C are a variety of views from different angles of the aerosol provision article of FIG. 7 .

DETAILED DESCRIPTION

Aspects and features of certain examples and embodiments are discussed/described herein. Some aspects and features of certain examples and embodiments may be implemented conventionally and these are not discussed/described in detail in the interests of brevity. It will thus be appreciated that aspects and features of apparatus and methods discussed herein which are not described in detail may be implemented in accordance with any conventional techniques for implementing such aspects and features.

The present disclosure relates to a “non-combustible” aerosol provision system. A “non-combustible” aerosol provision system is one where a constituent aerosolizable material of the aerosol provision system (or component thereof) is not combusted or burned in order to facilitate delivery of an aerosol to a user. Furthermore, and as is common in the technical field, the terms “vapor” and “aerosol”, and related terms such as “vaporize”, “volatilize” and “aerosolize”, may generally be used interchangeably.

In some implementations, the non-combustible aerosol provision system is an electronic cigarette, also known as a vaping device or electronic nicotine delivery system (END), although it is noted that the presence of nicotine in the aerosolizable material is not a requirement. Throughout the following description the term “e-cigarette” or “electronic cigarette” is sometimes used but this term may be used interchangeably with aerosol (vapor) provision system.

Typically, the non-combustible aerosol provision system may comprise a non-combustible aerosol provision device and an article (sometimes referred to as a consumable) for use with the non-combustible aerosol provision device. However, it is envisaged that articles which themselves comprise a means for powering an aerosol generating component may themselves form the non-combustible aerosol provision system.

The article, part or all of which, is intended to be consumed during use by a user. The article may comprise or consist of aerosolizable material. The article may comprise one or more other elements, such as a filter or an aerosol modifying substance (e.g. a component to add a flavor to, or otherwise alter the properties of, an aerosol that passes through or over the aerosol modifying substance).

Non-combustible aerosol provision systems often, though not always, comprise a modular assembly including both a reusable aerosol provision device and a replaceable article. In some implementations, the non-combustible aerosol provision device may comprise a power source and a controller (or control circuitry). The power source may, for example, be an electric power source, such as a battery or rechargeable battery. In some implementations, the non-combustible aerosol provision device may also comprise an aerosol generating component. However, in other implementations the article may comprise partially, or entirely, the aerosol generating component.

In some implementations, the aerosol generating component is a heater capable of interacting with the aerosolizable material so as to release one or more volatiles from the aerosolizable material to form an aerosol. In some embodiments, the aerosol generating component is capable of generating an aerosol from the aerosolizable material without heating. For example, the aerosol generating component may be capable of generating an aerosol from the aerosolizable material without applying heat thereto, for example via one or more of vibrational, mechanical, pressurization or electrostatic means.

The article for use with the non-combustible aerosol provision device generally comprises an aerosolizable material. Aerosolizable material, which also may be referred to herein as aerosol generating material, is material that is capable of generating aerosol, for example when heated, irradiated or energized in any other way. Aerosolizable material may, for example, be in the form of a solid, liquid or gel which may or may not contain nicotine and/or flavorant. In the following disclosure, the aerosolizable material is described as comprising an “amorphous solid”, which may alternatively be referred to as a “monolithic solid” (e.g. non-fibrous). In some implementations, the amorphous solid may be a dried gel. The amorphous solid is a solid material that may retain some fluid, such as liquid, within it. In some implementations, the aerosolizable material may for example comprise from about 50 wt %, 60 wt % or 70 wt % of amorphous solid, to about 90 wt %, 95 wt % or 100 wt % of amorphous solid. However, it should be appreciated that principles of the present disclosure may be applied to other aerosolizable materials, such as tobacco, reconstituted tobacco, a liquid, such as an e-liquid, etc.

As appropriate, the aerosolizable material may comprise any one or more of: an active constituent, a carrier constituent, a flavor, and one or more other functional constituents.

The active constituent as used herein may be a physiologically active material, which is a material intended to achieve or enhance a physiological response. The active constituent may for example be selected from nutraceuticals, nootropics, psychoactives. The active constituent may be naturally occurring or synthetically obtained. The active constituent may comprise for example nicotine, caffeine, taurine, theine, vitamins such as B6 or B12 or C, melatonin, cannabinoids, or constituents, derivatives, or combinations thereof. The active constituent may comprise one or more constituents, derivatives or extracts of tobacco, cannabis or another botanical. As noted herein, the active constituent may comprise one or more constituents, derivatives or extracts of cannabis, such as one or more cannabinoids or terpenes.

In some embodiments, the active constituent comprises nicotine. In some embodiments, the active constituent comprises caffeine, melatonin or vitamin B12.

As noted herein, the active constituent may comprise or be derived from one or more botanicals or constituents, derivatives or extracts thereof. As used herein, the term “botanical” includes any material derived from plants including, but not limited to, extracts, leaves, bark, fibers, stems, roots, seeds, flowers, fruits, pollen, husk, shells or the like. Alternatively, the material may comprise an active compound naturally existing in a botanical, obtained synthetically. The material may be in the form of liquid, gas, solid, powder, dust, crushed particles, granules, pellets, shreds, strips, sheets, or the like. Example botanicals are tobacco, eucalyptus, star anise, hemp, cocoa, cannabis, fennel, lemongrass, peppermint, spearmint, rooibos, chamomile, flax, ginger, ginkgo biloba, hazel, hibiscus, laurel, licorice (liquorice), matcha, mate, orange skin, papaya, rose, sage, tea such as green tea or black tea, thyme, clove, cinnamon, coffee, aniseed (anise), basil, bay leaves, cardamom, coriander, cumin, nutmeg, oregano, paprika, rosemary, saffron, lavender, lemon peel, mint, juniper, elderflower, vanilla, wintergreen, beefsteak plant, curcuma, turmeric, sandalwood, cilantro, bergamot, orange blossom, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, carvi, verbena, tarragon, geranium, mulberry, ginseng, theanine, theacrine, maca, ashwagandha, damiana, guarana, chlorophyll, baobab or any combination thereof. The mint may be chosen from the following mint varieties: Mentha Arventis, Mentha c.v., Mentha niliaca, Mentha piperita, Mentha piperita citrata c.v., Mentha piperita c.v, Mentha spicata crispa, Mentha cardifolia, Memtha longifolia, Mentha suaveolens variegata, Mentha pulegium, Mentha spicata c.v. and Mentha suaveolens

In some embodiments, the active constituent comprises or is derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is tobacco.

In some embodiments, the active constituent comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from eucalyptus, star anise, cocoa and hemp.

In some embodiments, the active constituent comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from rooibos and fennel.

In some implementations, the aerosolizable material comprises a flavor (or flavorant).

As used herein, the terms “flavor” and “flavorant” refer to materials which, where local regulations permit, may be used to create a desired taste, aroma or other somatosensorial sensation in a product for adult consumers. They may include naturally occurring flavor materials, botanicals, extracts of botanicals, synthetically obtained materials, or combinations thereof (e.g., tobacco, cannabis, licorice (liquorice), hydrangea, eugenol, Japanese white bark magnolia leaf, chamomile, fenugreek, clove, maple, matcha, menthol, Japanese mint, aniseed (anise), cinnamon, turmeric, Indian spices, Asian spices, herb, wintergreen, cherry, berry, red berry, cranberry, peach, apple, orange, mango, clementine, lemon, lime, tropical fruit, papaya, rhubarb, grape, durian, dragon fruit, cucumber, blueberry, mulberry, citrus fruits, Drambuie, bourbon, scotch, whiskey, gin, tequila, rum, spearmint, peppermint, lavender, aloe vera, cardamom, celery, cascarilla, nutmeg, sandalwood, bergamot, geranium, khat, naswar, betel, shisha, pine, honey essence, rose oil, vanilla, lemon oil, orange oil, orange blossom, cherry blossom, cassia, caraway, cognac, jasmine, ylang-ylang, sage, fennel, wasabi, piment, ginger, coriander, coffee, hemp, a mint oil from any species of the genus Mentha, eucalyptus, star anise, cocoa, lemongrass, rooibos, flax, ginkgo biloba, hazel, hibiscus, laurel, mate, orange skin, rose, tea such as green tea or black tea, thyme, juniper, elderflower, basil, bay leaves, cumin, oregano, paprika, rosemary, saffron, lemon peel, mint, beefsteak plant, curcuma, cilantro, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon balm, lemon basil, chive, carvi, verbena, tarragon, limonene, thymol, camphene), flavor enhancers, bitterness receptor site blockers, sensorial receptor site activators or stimulators, sugars and/or sugar substitutes (e.g., sucralose, acesulfame potassium, aspartame, saccharine, cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol), and other additives such as charcoal, chlorophyll, minerals, botanicals, or breath freshening agents. They may be imitation, synthetic or natural ingredients or blends thereof. They may be in any suitable form, for example, liquid such as an oil, solid such as a powder, or gas.

In some embodiments, the flavor comprises menthol, spearmint and/or peppermint. In some embodiments, the flavor comprises flavor components of cucumber, blueberry, citrus fruits and/or redberry. In some embodiments, the flavor comprises eugenol. In some embodiments, the flavor comprises flavor components extracted from tobacco. In some embodiments, the flavor comprises flavor components extracted from cannabis.

In some embodiments, the flavor may comprise a sensate, which is intended to achieve a somatosensorial sensation which are usually chemically induced and perceived by the stimulation of the fifth cranial nerve (trigeminal nerve), in addition to or in place of aroma or taste nerves, and these may include agents providing heating, cooling, tingling, numbing effect. A suitable heat effect agent may be, but is not limited to, vanillyl ethyl ether and a suitable cooling agent may be, but not limited to eucolyptol, WS-3.

The carrier constituent may comprise one or more constituents capable of forming an aerosol. In some embodiments, the carrier constituent may comprise one or more of glycerine, glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,3-butylene glycol, erythritol, meso-Erythritol, ethyl vanillate, ethyl laurate, a diethyl suberate, triethyl citrate, triacetin, a diacetin mixture, benzyl benzoate, benzyl phenyl acetate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene carbonate.

In some embodiments, the carrier constituent comprises one or more polyhydric alcohols, such as propylene glycol, triethylene glycol, 1,3-butanediol and glycerin; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and/or aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.

The one or more other functional constituents may comprise one or more of pH regulators, coloring agents, preservatives, binders, fillers, stabilizers, and/or antioxidants.

The aerosolizable material may also comprise an acid. The acid may be an organic acid. In some of these embodiments, the acid may be at least one of a monoprotic acid, a diprotic acid and a triprotic acid. In some such embodiments, the acid may contain at least one carboxyl functional group. In some such embodiments, the acid may be at least one of an alpha-hydroxy acid, carboxylic acid, dicarboxylic acid, tricarboxylic acid and keto acid. In some such embodiments, the acid may be an alpha-keto acid.

In some such embodiments, the acid may be at least one of succinic acid, lactic acid, benzoic acid, citric acid, tartaric acid, fumaric acid, levulinic acid, acetic acid, malic acid, formic acid, sorbic acid, benzoic acid, propanoic and pyruvic acid.

Suitably the acid is lactic acid. In other embodiments, the acid is benzoic acid. In other embodiments the acid may be an inorganic acid. In some of these embodiments the acid may be a mineral acid. In some such embodiments, the acid may be at least one of sulphuric acid, hydrochloric acid, boric acid and phosphoric acid. In some embodiments, the acid is levulinic acid.

The inclusion of an acid may be particularly advantageous in embodiments in which the aerosolizable material comprises nicotine. In such embodiments, the presence of an acid may stabilize dissolved species in the slurry from which the aerosolizable material is formed. The presence of the acid may reduce or substantially prevent evaporation of nicotine during drying of the slurry, thereby reducing loss of nicotine during manufacturing.

In some embodiments, the aerosolizable material comprises one or more cannabinoid compounds selected from the group consisting of: cannabidiol (CBD), tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA), cannabidiolic acid (CBDA), cannabinol (CBN), cannabigerol (CBG), cannabichromene (CBC), cannabicyclol (CBL), cannabivarin (CBV), tetrahydrocannabivarin (THCV), cannabidivarin (CBDV), cannabichromevarin (CBCV), cannabigerovarin (CBGV), cannabigerol monomethyl ether (CBGM) and cannabielsoin (CBE), cannabicitran (CBT).

The aerosolizable material may comprise one or more cannabinoid compounds selected from the group consisting of cannabidiol (CBD) and THC (tetrahydrocannabinol).

The aerosolizable material may comprise cannabidiol (CBD).

The aerosolizable material may comprise nicotine and cannabidiol (CBD).

The aerosolizable material may comprise nicotine, cannabidiol (CBD), and THC (tetrahydrocannabinol).

The aerosolizable material may be present on or in a carrier support (or carrier component) to form a substrate. The carrier support may, for example, be or comprise paper, card, paperboard, cardboard, reconstituted aerosolizable material, a plastics material, a ceramic material, a composite material, glass, a metal, or a metal alloy.

In some implementations, the article for use with the non-combustible aerosol provision device may comprise aerosolizable material or an area for receiving aerosolizable material. In some implementations, the article for use with the non-combustible aerosol provision device may comprise a mouthpiece, or alternatively the non-combustible aerosol provision device may comprise a mouthpiece which communicates with the article. The area for receiving aerosolizable material may be a storage area for storing aerosolizable material. For example, the storage area may be a reservoir.

FIG. 1 is a cross-sectional view through a schematic representation of an aerosol provision system 1 in accordance with certain embodiments of the disclosure. The aerosol provision system 1 comprises two main components, namely an aerosol provision device 2 and an aerosol generating article 4.

The aerosol provision device 2 comprises an outer housing 21, a power source 22, control circuitry 23, a plurality of aerosol generating components 24, a receptacle 25, a mouthpiece end 26, an air inlet 27, an air outlet 28, a touch-sensitive panel 29, an inhalation sensor 30, and an end of use indicator 31.

The outer housing 21 may be formed from any suitable material, for example a plastics material. The outer housing 21 is arranged such that the power source 22, control circuitry 23, aerosol generating components 24, receptacle 25 and inhalation sensor 30 are located within the outer housing 21. The outer housing 21 also defines the air inlet 27 and air outlet 28, described in more detail below. The touch sensitive panel 29 and end of use indicator are located on the exterior of the outer housing 21.

The outer housing 21 further includes a mouthpiece end 26. The outer housing 21 and mouthpiece end 26 are formed as a single component (that is, the mouthpiece end 26 forms a part of the outer housing 21). The mouthpiece end 26 is defined as a region of the outer housing 21 which includes the air outlet 28 and is shaped in such a way that a user may comfortably place their lips around the mouthpiece end 26 to engage with air outlet 28. In FIG. 1 , the thickness of the outer housing 21 decreases towards the air outlet 28 to provide a relatively thinner portion of the device 2 which may be more easily accommodated by the lips of a user. In other implementations, however, the mouthpiece end 26 may be a removable component that is separate from but able to be coupled to the outer housing 21, and may be removed for cleaning and/or replacement with another mouthpiece end 26.

The power source 22 is configured to provide operating power to the aerosol provision device 2. The power source 22 may be any suitable power source, such as a battery. For example, the power source 22 may comprise a rechargeable battery, such as a Lithium Ion battery. The power source 22 may be removable or form an integrated part of the aerosol provision device 2. In some implementations, the power source 22 may be recharged through connection of the device 2 to an external power supply (such as mains power) through an associated connection port, such as a USB port (not shown) or via a suitable wireless receiver (not shown).

The control circuitry 23 is suitably configured/programmed to control the operation of the aerosol provision device to provide certain operating functions of aerosol provision device 2. The control circuitry 23 may be considered to logically comprise various sub-units/circuitry elements associated with different aspects of the aerosol provision devices' operation. For example, the control circuitry 23 may comprise a logical sub-unit for controlling the recharging of the power source 22. Additionally, the control circuitry 23 may comprise a logical sub-unit for communication, e.g., to facilitate data transfer from or to the device 2. However, a primary function of the control circuitry 23 is to control the aerosolization of aerosol generating material, as described in more detail below. It will be appreciated the functionality of the control circuitry 23 can be provided in various different ways, for example using one or more suitably programmed programmable computer(s) and/or one or more suitably configured application-specific integrated circuit(s)/circuitry/chip(s)/chipset(s) configured to provide the desired functionality. The control circuitry 23 is connected to the power supply 23 and receives power from the power source 22 and may be configured to distribute or control the power supply to other components of the aerosol provision device 2.

In the described implementation, the aerosol provision device 2 further comprises a receptacle 25 which is arranged to receive an aerosol generating article 4.

The aerosol generating article 4 comprises a carrier component 42 and aerosol generating material 44. The aerosol generating article 4 is shown in more detail in FIGS. 2A to 2C. FIG. 2A is a top-down view of the article 4, FIG. 2B is an end-on view along the longitudinal (length) axis of the article 4, and FIG. 2C is a side-on view along the width axis of the article 4.

The article 4 comprises a carrier component 42 which in this implementation is formed of card. The carrier component 42 forms the majority of the article 4, and acts as a base for the aerosol generating material 44 to be deposited on.

The carrier component 42 is broadly cuboidal in shape has a length l, a width w and a thickness t_(c) as shown in FIGS. 2A to 2C. By way of a concrete example, the length of the carrier component 42 may be 30 to 80 mm, the width may be 7 to 25 mm, and the thickness may be between 0.2 to 1 mm. However, it should be appreciated that the above are exemplary dimensions of the carrier component 42, and in other implementations the carrier component 42 may have different dimensions as appropriate. In some implementations, the carrier component 42 may comprise one or more protrusions extending in the length and/or width directions of the carrier component 42 to help facilitate handling of the article 4 by the user.

In the example shown in FIGS. 1 and 2 , the article 4 comprises a plurality of discrete portions of aerosol generating material 44 disposed on a surface of the carrier component 42. More specifically, the article 4 comprises six discrete portions of aerosol generating material 44, labelled 44 a to 44 f, disposed in a two by three array. However, it should be appreciated that in other implementations a greater or lesser number of discrete portions may be provided, and/or the portions may be disposed in a different array (e.g., a one by six array). In the example shown, the aerosol generating material 44 is disposed at discrete, separate locations on a single surface of the component carrier 42. The discrete portions of aerosol generating material 44 are shown as having a circular footprint, although it should be appreciated that the discrete portions of aerosol generating material 44 may take any other footprint, such as square or rectangular, as appropriate. The discrete portions of aerosol generating material 44 have a diameter d and a thickness t_(a) as shown in FIGS. 2A to 2C. The thickness t_(a) may take any suitable value, for example the thickness t_(a) may be in the range of 50 μm to 1.5 mm. In some embodiment, the thickness t_(a) is from about 50 μm to about 200 μm, or about 50 μm to about 100 μm, or about 60 μm to about 90 μm, suitably about 77 μm. In other embodiments, the thickness t_(a) may be greater than 200 μm, e.g., from about 50 μm to about 400 μm, or to about 1 mm, or to about 1.5 mm.

The discrete portions of aerosol generating material 44 are separate from one another such that each of the discrete portions may be energized (e.g., heated) individually/selectively to produce an aerosol. In some implementations, the portions of aerosol generating material 44 may have a mass no greater than 20 mg, such that the amount of material to be aerosolized by a given aerosol generating component 24 at any one time is relatively low. For example, the mass per portion may be equal to or lower than 20 mg, or equal to or lower than 10 mg, or equal to or lower than 5 mg. Of course, it should be appreciated that the total mass of the article 4 may be greater than 20 mg.

In the described implementation, at least two of the portions of aerosol generating material 44 of the article 4 are different from one another. As described in more detail below, the device 2 is configured to allow the user to select which ones of the portions of aerosol generating material to aerosolize for a particular inhalation. When the portions of aerosol generating material 44 are different from one another, this allows a user to customize the aerosol that is received per inhalation or per inhalation session.

In the described implementation, the aerosol generating material 44 is an amorphous solid. Generally, the amorphous solid may comprise a gelling agent (sometimes referred to as a binder) and an aerosol generating agent (which might comprise glycerol, for example). Optionally, the aerosol generating material may comprise one or more of the following: an active substance (which may include a tobacco extract), a flavorant, an acid, and a filler. Other components may also be present as desired. Suitable active substances, flavorant, acids and fillers are described above in relation to the aerosolizable material.

Thus the aerosol generating agent may comprise one or more of glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,3-butylene glycol, erythritol, meso-Erythritol, ethyl vanillate, ethyl laurate, a diethyl suberate, triethyl citrate, triacetin, a diacetin mixture, benzyl benzoate, benzyl phenyl acetate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene carbonate.

In some embodiments, the aerosol generating agent comprises one or more polyhydric alcohols, such as propylene glycol, triethylene glycol, 1,3-butanediol and glycerin; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and/or aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.

In some embodiments, the gelling agent comprises a hydrocolloid. In some embodiments, the gelling agent comprises one or more compounds selected from the group comprising alginates, pectins, starches (and derivatives), celluloses (and derivatives, such as such as methylcellulose, hydroxypropyl cellulose, and carboxymethyl cellulose (CMC)), gums, silica or silicones compounds, clays, polyvinyl alcohol and combinations thereof. For example, in some embodiments, the gelling agent comprises one or more of alginates, pectins, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethylcellulose, pullulan, xanthan gum, guar gum, carrageenan, agarose, acacia gum, fumed silica, PDMS, sodium silicate, kaolin and polyvinyl alcohol.

The gelling agent may comprise one or more compounds selected from cellulosic gelling agents, non-cellulosic gelling agents, guar gum, acacia gum and mixtures thereof.

In some embodiments, the cellulosic gelling agent is selected from the group consisting of: hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethylcellulose (CMC), hydroxypropyl methylcellulose (HPMC), methyl cellulose, ethyl cellulose, cellulose acetate (CA), cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP) and combinations thereof.

In some embodiments, the gelling agent comprises (or is) one or more of hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose (HPMC), carboxymethylcellulose, guar gum, or acacia gum.

In some embodiments, the gelling agent comprises (or is) one or more non-cellulosic gelling agents, including, but not limited to, agar, xanthan gum, gum Arabic, guar gum, locust bean gum, pectin, carrageenan, starch, alginate, and combinations thereof. In embodiments, the non-cellulose based gelling agent is alginate or agar.

The aerosol-generating material may comprise an acid. The acid may be an organic acid. In some of these embodiments, the acid may be at least one of a monoprotic acid, a diprotic acid and a triprotic acid. In some such embodiments, the acid may contain at least one carboxyl functional group. In some such embodiments, the acid may be at least one of an alpha-hydroxy acid, carboxylic acid, dicarboxylic acid, tricarboxylic acid and keto acid. In some such embodiments, the acid may be an alpha-keto acid.

In some such embodiments, the acid may be at least one of succinic acid, lactic acid, benzoic acid, citric acid, tartaric acid, fumaric acid, levulinic acid, acetic acid,

malic acid, formic acid, sorbic acid, benzoic acid, propanoic and pyruvic acid.

Suitably the acid is lactic acid. In other embodiments, the acid is benzoic acid. In other embodiments the acid may be an inorganic acid. In some of these embodiments the acid may be a mineral acid. In some such embodiments, the acid may be at least one of sulphuric acid, hydrochloric acid, boric acid and phosphoric acid. In some embodiments, the acid is levulinic acid.

The inclusion of an acid may be particularly advantageous in embodiments in which the aerosol-generating material comprises nicotine. In such embodiments, the presence of an acid may stabilize dissolved species in the slurry from which the aerosol-generating material is formed. The presence of the acid may reduce or substantially prevent evaporation of nicotine during drying of the slurry, thereby reducing loss of nicotine during manufacturing.

In certain embodiments, the aerosol-generating material comprises a gelling agent comprising a cellulosic gelling agent and/or a non-cellulosic gelling agent, an active substance and an acid.

In some embodiments, the aerosol-generating material comprises one or more cannabinoid compounds selected from the group consisting of: cannabidiol (CBD), tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA), cannabidiolic acid (CBDA), cannabinol (CBN), cannabigerol (CBG), cannabichromene (CBC), cannabicyclol (CBL), cannabivarin (CBV), tetrahydrocannabivarin (THCV), cannabidivarin (CBDV), cannabichromevarin (CBCV), cannabigerovarin (CBGV), cannabigerol monomethyl ether (CBGM) and cannabielsoin (CBE), cannabicitran (CBT).

The aerosol-generating material may comprise one or more cannabinoid compounds selected from the group consisting of cannabidiol (CBD) and THC (tetrahydrocannabinol).

The aerosol-generating material may comprise cannabidiol (CBD).

The aerosol-generating material may comprise nicotine and cannabidiol (CBD).

The aerosol-generating material may comprise nicotine, cannabidiol (CBD), and THC (tetrahydrocannabinol).

The amorphous solid may comprise a colorant. The addition of a colorant may alter the visual appearance of the amorphous solid. The presence of colorant in the amorphous solid may enhance the visual appearance of the amorphous solid and the aerosol-generating material. By adding a colorant to the amorphous solid, the amorphous solid may be color-matched to other components of the aerosol-generating material or to other components of an article comprising the amorphous solid.

A variety of colorants may be used depending on the desired color of the amorphous solid. The color of amorphous solid may be, for example, white, green, red, purple, blue, brown or black. Other colors are also envisaged. Natural or synthetic colorants, such as natural or synthetic dyes, food-grade colorants and pharmaceutical-grade colorants may be used. In certain embodiments, the colorant is caramel, which may confer the amorphous solid with a brown appearance. In such embodiments, the color of the amorphous solid may be similar to the color of other components (such as tobacco material) in an aerosol-generating material comprising the amorphous solid. In some embodiments, the addition of a colorant to the amorphous solid renders it visually indistinguishable from other components in the aerosol-generating material.

The colorant may be incorporated during the formation of the amorphous solid (e.g. when forming a slurry comprising the materials that form the amorphous solid) or it may be applied to the amorphous solid after its formation (e.g. by spraying it onto the amorphous solid).

An amorphous solid aerosolizable material offers some advantages over other types of aerosolizable materials commonly found in some electronic aerosol provision devices. For example, compared to electronic aerosol provision devices which aerosolize a liquid aerosolizable material, the potential for the amorphous solid to leak or otherwise flow from a location at which the amorphous solid is stored is greatly reduced. This means aerosol provision devices or articles may be more cheaply manufactured as the components do not necessarily require the same liquid-tight seals or the like to be used.

Compared to electronic aerosol provision devices which aerosolize a solid aerosolizable material, e.g., tobacco, a comparably lower mass of amorphous solid material can be aerosolized to generate an equivalent amount of aerosol (or to provide an equivalent amount of a constituent in the aerosol, e.g., nicotine). This is partially due to the fact that an amorphous solid can be tailored to not include unsuitable constituents that might be found in other solid aerosolizable materials (e.g., cellulosic material in tobacco, for example). For example, in some implementations, the mass per portion of amorphous solid is no greater than 20 mg, or no greater than 10 mg, or no greater than 5 mg. Accordingly, the aerosol provision device can supply relatively less power to the aerosol generating component and/or the aerosol generating component can be comparably smaller to generate a similar aerosol, thus meaning the energy requirements for the aerosol provision device may be reduced.

In some implementations, the amorphous solid may comprise 0.5-60 wt % of a gelling agent; 5-80 wt % of an aerosol generating agent; and 5-60 wt % of at least one active substance, wherein these weights are calculated on a dry weight basis. Such amorphous solids may contain an active substance, but no flavor or acid. Such amorphous solids may be referred to as “active substance rich” or “active substance amorphous solids”. For example, in one implementation, the active substance may be nicotine, and as such an amorphous solid as described above comprising nicotine may be referred to as a “nicotine amorphous solid”. More generally, this is an example of an active substance rich aerosol generating material which, as the name suggests, is a portion of aerosol generating material which is designed to deliver an active substance when aerosolized.

In these implementations, amorphous solid may have the following composition (by Dry Weight Basis, DWB): gelling agent in an amount of from about 5 wt % to about 40 wt %, or about 10 wt % to 30 wt %, or about 15 wt % to about 25 wt %; aerosol generating agent in an amount of from about 10 wt % to about 50 wt %, or from about 20 wt % to about 40 wt %, or from about 25 wt % to about 35 wt % (DWB), active substance in an amount of from about 30 wt % to about 60 wt %, or from about 40 wt % to 55 wt %, or from about 45 wt % to about 50 wt %.

In one implementation, the amorphous solid comprises about 43 wt % gelling agent (12 wt % alginate and 31 wt % CMC), about 48 wt % glycerol, and about 6 wt % nicotine (DWB).

In some other implementations, the amorphous solid may comprise 0.5-60 wt % of a gelling agent; and 5-80 wt % of an aerosol generating agent, wherein these weights are calculated on a dry weight basis. Such amorphous solids may contain no flavor, no acid and no active substance. Such amorphous solids may be referred to as “aerosol generating agent rich” or “aerosol generating agent amorphous solids”. More generally, this is an example of an aerosol generating agent rich aerosol generating material which, as the name suggests, is a portion of aerosol generating material which is designed to deliver aerosol generating agent when aerosolized.

In these implementations, the amorphous solid may have the following composition (DWB): gelling agent in an amount of from about 5 wt % to about 40 wt %, or about 10 wt % to 30 wt %, or about 15 wt % to about 25 wt %; aerosol generating agent in an amount of from about 10 wt % to about 50 wt %, or from about 20 wt % to about 40 wt %, or from about 25 wt % to about 35 wt % (DWB).

In one implementation, the amorphous solid comprises about 43 wt % gelling agent (12 wt % alginate and 31 wt % CMC), and about 56 wt % glycerol (DWB).

In some other implementations, the amorphous solid may comprise 0.5-60 wt % of a gelling agent; 5-80 wt % of an aerosol generating agent; and 1-60 wt % of a flavor, wherein these weights are calculated on a dry weight basis. Such amorphous solids may contain flavor, but no active substance or acid. Such amorphous solids may be referred to as “flavorant rich” or “flavor amorphous solids”. More generally, this is an example of a flavorant rich aerosol generating material which, as the name suggests, is a portion of aerosol generating material which is designed to deliver flavorant when aerosolized.

In these implementations, the amorphous solid may have the following composition (DWB): gelling agent in an amount of from about 5 wt % to about 40 wt %, or about 10 wt % to 30 wt %, or about 15 wt % to about 25 wt %; aerosol generating agent in an amount of from about 10 wt % to about 50 wt %, or from about 20 wt % to about 40 wt %, or from about 25 wt % to about 35 wt % (DWB), flavor in an amount of from about 30 wt % to about 60 wt %, or from about 40 wt % to 55 wt %, or from about 45 wt % to about 50 wt %.

In one implementation, the amorphous solid comprises about 43 wt % gelling agent (12 wt % alginate and 31 wt % CMC), about 19 wt % glycerol, and about 37 wt % flavor (DWB).

In some other implementations, the amorphous solid may comprise 0.5-60 wt % of a gelling agent; 5-80 wt % of an aerosol generating agent; and 0.1-10 wt % of an acid, wherein these weights are calculated on a dry weight basis. Such amorphous solids may contain acid, but no active substance and flavorant. Such amorphous solids may be referred to as “acid rich” or “acid amorphous solids”. More generally, this is an example of an acid rich aerosol generating material which, as the name suggests, is a portion of aerosol generating material which is designed to deliver an acid when aerosolized.

In these implementations, the amorphous solid may have the following composition (DWB): gelling agent in an amount of from about 5 wt % to about 40 wt %, or about 10 wt % to 30 wt %, or about 15 wt % to about 25 wt %; aerosol generating agent in an amount of from about 10 wt % to about 50 wt %, or from about 20 wt % to about 40 wt %, or from about 25 wt % to about 35 wt % (DWB), acid in an amount of from about 0.1 wt % to about 8 wt %, or from about 0.5 wt % to 7 wt %, or from about 1 wt % to about 5 wt %, or form about 1 wt % to about 3 wt %.

In one implementation, the amorphous solid comprises about 56 wt % gelling agent (24 wt % alginate and 32 wt % CMC), about 39 wt % glycerol, and about 3 wt % acid (DWB).

In some embodiments, the amorphous solid comprises tobacco extract. In these embodiments, the amorphous solid may have the following composition (DWB): gelling agent (e.g., comprising alginate) in an amount of from about 1 wt % to about 60 wt %, or about 10 wt % to 30 wt %, or about 15 wt % to about 25 wt %; tobacco extract in an amount of from about 10 wt % to about 60 wt %, or from about 40 wt % to 55 wt %, or from about 45 wt % to about 50 wt %; aerosol generating agent (e.g., comprising glycerol) in an amount of from about 5 wt % to about 60 wt %, or from about 20 wt % to about 40 wt %, or from about 25 wt % to about 35 wt % (DWB). The tobacco extract may be from a single variety of tobacco or a blend of extracts from different varieties of tobacco. Such amorphous solids may be referred to as “tobacco amorphous solids”, and may be designed to deliver a tobacco-like experience when aerosolized.

In one implementation, the amorphous solid comprises about 20 wt % alginate gelling agent, about 48 wt % Virginia tobacco extract and about 32 wt % glycerol (DWB).

The amorphous solid of these embodiments may have any suitable water content. For example, the amorphous solid may have a water content of from about 5 wt % to about 15 wt %, or from about 7 wt % to about 13 wt %, or about 10 wt %.

Suitably, in any of these embodiments, the amorphous solid has a thickness t_(a) which may be set in dependence on how the article 4 is to be used, as described in more detail below. In some implementations, the thickness t_(a) may be set to be the range of between about 0.5 to about 2 mm, or between about 0.8 to about 1.2 mm. In some other implementations, the thickness may be from about 50 μm to about 200 μm, or about 50 μm to about 100 μm, or about 60 μm to about 90 μm, suitably about 77 μm.

The receptacle 25 is suitable sized to removably receive the article 4 therein. Although not shown, the device 2 may comprise a hinged door or removable part of the outer housing 21 to permit access to the receptacle 25 such that a user may insert and/or remove the article 4 from the receptacle 25. The hinged door or removable part of the outer housing 21 may also act to retain the article 4 within the receptacle 25 when closed. When the aerosol generating article 4 is exhausted or the user simply wishes to switch to a different aerosol generating article 4, the aerosol generating article 4 may be removed from the aerosol provision device 2 and a replacement aerosol generating article 4 positioned in the receptacle 25 in its place. Alternatively, the device 2 may include a permanent opening that communicates with the receptacle 25 and through which the article 4 can be inserted into the receptacle 25. In such implementations, a retaining mechanism for retaining the article 4 within the receptacle 25 of the device 2 may be provided.

As seen in FIG. 1 , the device 2 comprises a number of aerosol generating components 24. In the described implementation, the aerosol generating components 24 are heating elements 24, and more specifically resistive heating elements 24. Resistive heating elements 24 receive an electrical current and convert the electrical energy into heat. The resistive heating elements 24 may be formed from, or comprise, any suitable resistive heating material, such as NiChrome (Ni20Cr80), which generates heat upon receiving an electrical current. In one implementation, the heating elements 24 may comprise an electrically insulating substrate on which resistive tracks are disposed. However, as discussed above and as should be appreciated, the heating elements may be any suitable form of heating element.

FIG. 3 is a cross-sectional, top-down view of the aerosol provision device 2 showing the arrangement of the heating elements 24 in more detail. In FIGS. 1 and 3 , the heating elements 24 are positioned such that a surface of the heating element 24 forms a part of the surface of the receptacle 25. That is, an outer surface of the heating elements 24 is flush with the inner surface of the receptacle. More specifically, the outer surface of the heating element 24 that is flush with the inner surface of the receptacle 25 is a surface of the heating element 24 that is heated (e.g., its temperature increases) when an electrical current is passed through the heating element 24.

The heating elements 24 are arranged such that, when the article 4 is received in the receptacle 25, each heating element 24 aligns with a corresponding discrete portion of aerosol generating material 44. Hence, in this example, six heating elements 24 are arranged in two by three array broadly corresponding to the arrangement of the two by three array of the six discrete portions of aerosol generating material 44 shown in FIGS. 2A to 2C. However, as discussed above, the number of heating elements 24 may be different in different implementations, for example there may be 8, 10, 12, 14, etc. heating elements 24. In some implementations, the number of heating elements 24 is greater than or equal to six but no greater than 20.

More specifically, the heating elements 24 are labelled 24 a to 24 f in FIG. 3 , and it should be appreciated that each heating element 24 is arranged to align with a corresponding portion of aerosol generating material 44 as denoted by the corresponding letter following the references 24/44. Accordingly, each of the heating elements 24 can be individually activated to heat a corresponding portion of aerosol generating material 44.

While the heating elements 24 are shown flush with the inner surface of the receptacle 25, in other implementations the heating elements 24 may protrude into the receptacle 25. In either case, the article 4 contacts the surfaces of the heating elements 24 when present in the receptacle 25 such that heat generated by the heating elements 24 is conducted to the aerosol generating material 44 through the carrier component 42.

In some implementations, to improve the heat-transfer efficiency, the receptacle may comprise components which apply a force to the surface of the carrier component 42 so as to press the carrier component 42 onto the heater elements 24, thereby increasing the efficiency of heat transfer via conduction to the aerosol generating material 44. Additionally or alternatively, the heater elements 24 may be configured to move in the direction towards/away from the article 4, and may be pressed into the surface of carrier component 42 that does not comprise the aerosol generating material 44.

In use, the device 2 (and more specifically the control circuitry 23) is configured to deliver power to the heating elements 24 in response to a user input. Broadly speaking, the control circuitry 23 is configured to selectively apply power to the heating elements 24 to subsequently heat the corresponding portions of aerosol generating material 44 to generate aerosol. When a user inhales on the device 2 (e.g., inhales at mouthpiece end 26), air is drawn into the device 2 through air inlet 27, into the receptacle 25 where it mixes with the aerosol generated by heating the aerosol generating material 44, and then to the user's mouth via air outlet 28. That is, the aerosol is delivered to the user through mouthpiece end 26 and air outlet 28.

The device 2 of FIG. 1 includes a touch-sensitive panel 29 and an inhalation sensor 30. Collectively, the touch-sensitive panel 29 and inhalation sensor 30 act as mechanisms for a receiving a user input to cause the generation of aerosol, and thus may more broadly be referred to as user input mechanisms. The received user input may be said to be indicative of a user's desire to generate aerosol.

The touch-sensitive panel 29 may be a capacitive touch sensor and can be operated by a user of the device 2 placing their finger or another suitably conductive object (for example a stylus) on the touch-sensitive panel. In the described implementation, the touch-sensitive panel includes a region which can be pressed by a user to start aerosol generation. The control circuitry 23 may be configured to receive signaling from the touch-sensitive panel 29 and to use this signaling to determine if a user is pressing (e.g. activating) the region of the touch-sensitive panel 29. If the control circuitry 23 receives this signaling, then the control circuitry 23 is configured to supply power from the power source 22 to one or more of the heating elements 24. Power may be supplied for a predetermined time period (for example, three seconds) from the moment a touch is detected, or in response to the length of time the touch is detected for. In other implementations, the touch sensitive panel 29 may be replaced by a user actuatable button or the like.

The inhalation sensor 30 may be a pressure sensor or microphone or the like configured to detect a drop in pressure or a flow of air caused by the user inhaling on the device 2. The inhalation sensor 30 is located in fluid communication with the air flow pathway (that is, in fluid communication with the air flow path between inlet 27 and outlet 28). In a similar manner as described above, the control circuitry 23 may be configured to receive signaling from the inhalation sensor and to use this signaling to determine if a user is inhaling on the aerosol provision system 1. If the control circuitry 23 receives this signaling, then the control circuitry 23 is configured to supply power from the power source 22 to one or more of the heating elements 24. Power may be supplied for a predetermined time period (for example, three seconds) from the moment inhalation is detected, or in response to the length of time the inhalation is detected for.

In the described example, both the touch-sensitive panel 29 and inhalation sensor 30 detect the user's desire to begin generating aerosol for inhalation. The control circuitry 23 may be configured to only supply power to the heating element 24 when signaling from both the touch-sensitive panel 29 and inhalation sensor 30 are detected. This may help prevent inadvertent activation of the heating elements 24 from accidental activation of one of the user input mechanisms. However, in other implementations, the aerosol provision system 1 may have only one of a touch sensitive panel 29 and an inhalation sensor 30.

These aspects of the operation of the aerosol provision system 1 (e.g. puff detection and touch detection) may in themselves be performed in accordance with established techniques (for example using conventional inhalation sensor and inhalation sensor signal processing techniques and using conventional touch sensor and touch sensor signal processing techniques).

Turning now to the operation of the device 2, in response to detecting the signaling from either one or both of the touch-sensitive panel 29 and inhalation sensor 30, the control circuitry 23 is configured to supply power to one or more of the heating elements 24, and in particular, when at least two heating elements 24 are selected to operate, the control circuitry 23 is configured to supply power to the at least two heating elements 24 simultaneously.

FIG. 4 is a flow diagram showing an exemplary method for generating aerosol in accordance with the present disclosure.

The method starts at step S1 where the user is able to set a heating configuration for subsequently heating the aerosol generating material 44 of the article 4. In essence, the user is able to select which heating elements 24 are activated when receiving the signaling from either one or both of the touch-sensitive panel 29 and inhalation sensor 30. In the described implementation, the user is able to select any one or more of the six heating elements 24 to activate, and correspondingly any one or more of the six discrete portions of aerosol generating material 44 to heat. In addition, in the described implementation, the user is also able to set the power to be delivered to each heating element 24, where it should be understood that, broadly speaking, a greater power supplied to the heating element 24 results in a relatively larger amount of aerosol being generated from the portion of aerosol generating material 44. In this way, the user can further customize the aerosol that is generated per inhalation or per session by selecting not only the presence of certain components, but also by selecting the relative proportion of those components in the aerosol. However, it should be appreciated that selecting the power level may be optional and in some implementations the level of power may be predetermined and fixed.

The heating configuration may be set manually by the user such that each individual heating element 24 is manually selectable and/or the level of power is manually selectable. In other implementations, the user may be able to select from a list of predefined heating configurations which may be pre-stored in the device 2 or may be obtained from a remote source (e.g., downloaded from a server).

FIG. 5 is a schematic top-down view of the touch-sensitive panel 29 which enables the user to select the heating elements to be activated. FIG. 5 schematically shows outer housing 21 and touch-sensitive panel 29 as described previously. The touch-sensitive panel 29 comprises six regions 29 a to 29 f which correspond to each of the six heating elements 24, and a region 29 g which corresponds to the region for indicating that a user wishes to start inhalation or generating aerosol as described previously. The six regions 29 a to 29 f each correspond to touch-sensitive regions which can be touched by a user to select one or more of the six heating elements 24 (and thus for the control circuitry 23 to provide power to one or more of the six corresponding heating elements 24). The touch-sensitive panel 29 can be said to be both a user input mechanism for allowing the user to set the heating configuration, and a user input mechanism for starting aerosol generation. It should be appreciated, however, that in other implementations, these two user input mechanisms may be provided by separate dedicate components (e.g., touch-sensitive panel and a push button).

As mentioned, the power level to each heating element 24 can also be set in certain implementations. In the described implementation, each heating element 24 can have multiple states, e.g., an off state in which no power is supplied to the heating element 24, a low power state in which a first level of power is supplied to the heating element 24, and a high power state in which a second level of power is supplied to the heating element 24, where the second level of power is greater than the first level of power. However, in other implementations, fewer or greater states may be available to the heating elements 24. To select the different power levels or states, the user may repeatedly tap the regions 29 a to 29 f to cycle through the different states (e.g., off, low power, high power, off, etc.). Alternatively, the user may press and hold the region 29 a to 29 f to cycle through the different states, where the duration of the press determines the state. Other suitable ways for the user to interact with the touch-sensitive panel to select the corresponding power level may be implemented in accordance with the principles of the present disclosure. The touch-sensitive panel 29 may be provided with one or more indicators for each of the respective regions 29 a to 29 f to indicate which state the heating element 24 is currently in. For example, the touch-sensitive panel may comprise one or more LEDs or similar illuminating elements, and the intensity of the LEDs signifies the current state of the heating element 24. Alternatively, a colored LED or similar illuminating element may be provided and the color indicates the current state. Alternatively, the touch-sensitive panel 29 may comprise a display element (e.g., which may underlie a transparent touch-sensitive panel 29 or be provided adjacent to the regions 29 a to 29 f of the touch-sensitive panel 29) which displays the current state of the heating element 24.

Accordingly, a user can set which heating elements 24 (and subsequently which portions of aerosol generating material 44) are to be heated (and optionally to what extent they are to be heated) by interacting with the touch-sensitive panel 29 in advance of generating aerosol. When the user has set the configuration for the heating elements 24 at step S1, at step S2 the device 2 receives signaling from either one or both of the touch-sensitive panel 29 (and more particularly region 29 g of touch-sensitive panel 29) and inhalation sensor 30 signifying a user's intention to inhale aerosol, as discussed above.

At step S3, in response to detecting the signaling from either one or both of the touch-sensitive panel 29 and inhalation sensor 30, the control circuitry 23 is configured to supply power to the selected heating elements 24 in accordance with the heating configuration set at step S1.

At step S4, the control circuitry 23 stops supplying power to the selected heating elements 24. This may be in response to, for example, the signaling stopping (if the signaling is output only when the user is inhaling on the device as detected by the inhalation sensor 30 or only when the user is pressing the region 29 g on the touch-sensitive panel 29), and/or in response to a predetermined time from the signaling first being detected elapsing.

The method may then proceed back to step S1 or S2 for the subsequent inhalations, where it should be understood that step S1 may or may not be implemented depending on whether the user decides to reset the heating configuration.

In principle, this method allows for simultaneous activation of a plurality of the heating element 24 s, and as such may be dubbed as “a simultaneous activation mode”. This is as opposed to a “sequential activation mode” in which the heating elements 24 are sequentially activated. However, it should be appreciated that the device 2 as described above may, in some situations, allow for the user to select only one heating element 24 (and thus only one portion of aerosol generating material) for a given user inhalation.

Although the method in FIG. 4 is described as supplying power to the selected heating elements 24 at step S3 in response to detecting signaling at step S2, and to subsequently stop supplying power to the selected heating elements 24 at step S4, it should be appreciated that in some implementations, the control circuitry 23 may be configured to pre-heat selected portions of aerosol generating material 44 before detecting signaling at step S2. This may be the case particularly if the portion of aerosol generating material is relatively thick (e.g., on the order of 1 mm). In these scenarios, applying energy via the heating element 24 for a period of between 2 to 5 seconds (typically corresponding to the length of a user's inhalation) may not be sufficient to raise the temperature of the aerosol generating material 44 to a release temperature (that is, a temperature at which the aerosol generating material releases its constituent components), e.g., due to the total mass that is required to be heated. Accordingly, pre-heating the portion(s) of aerosol generating material 44 may enable sufficient additional energy to be applied when the signaling is detected at step S1 to generate a sufficient aerosol. In these implementations, steps S3 and S4 in FIG. 4 should be understood as providing additional power to selected heating elements in accordance with the heating configuration to raise the temperature of the aerosol generating material 44 to an operational temperature at which aerosol is generated from the portion (step S3), and stopping the supply of the additional power to selected heating elements in accordance with the heating configuration to reduce the temperature of the aerosol generating material 44 to below an operational temperature (step S4). The target temperature (which may also be referred to as the operational temperature) is a temperature that the control circuitry 23 causes the heating element to reach to generate an aerosol. The operational temperature may therefore be one or more fixed values.

FIG. 6 is a graph depicting control signal outputs from control circuitry 23, which are ultimately used to supply different levels of power to the selected heating elements 24. The control signal causes the power supply 22 (or a power management apparatus, not shown, coupled to the power supply 22) to supply a level of power in accordance with the control signal to the selected heating elements, to cause the heating element to reach a certain target temperature. Hence, the control signals are therefore also representative of the temperature that the heating elements (and subsequently the aerosol generating material) are intended to reach during operation.

The magnitude of the control signal is shown on the y-axes of the graphs, while time t is shown on the x-axes. As seen in FIG. 6 , the control signals represent different target temperatures for the heating elements 24; more specifically, FIG. 6 shows a pre-heating target temperature T_(pre), a low target operational temperature, T_(op-low), and a high target operational temperature T_(op-high). The T_(op-high) and T_(op-low) correspond to the target temperatures associated with the high and low levels of power that can be supplied to the heating elements 24 mentioned above, while T_(pre) corresponds to a level of power supplied to the heating element during a pre-heat phase of operation. Hence, T_(op-high) represents a greater temperature than T_(op-low), while T_(op-low) is a higher temperature than T_(pre).

FIG. 6 shows two separate graphs: one for a first heating element (top) and one for a second heating element (bottom). In the foregoing description, the first heating element is heating element 24 a and the second heating element is heating element 24 b.

At a time t_(conf), the user finishes inputting the heating configuration to be used in the device 2 in accordance with step S1 in FIG. 4 . In this example, the heating configuration is set such that a high level of power is supplied to heating element 24 b, and a low level of power is supplied to heating element 24 a. All other heating elements are off, and thus no power is supplied to these heating elements in this example; hence, these elements are not shown in FIG. 6 . However, in other implementations, all heating elements 24 are supplied with power sufficient to raise the temperature of the heating element to T_(pre), regardless of whether the heating element is selected in step S1 of FIG. 4 .

In this implementation, as soon as the configuration is set at t_(conf), the control circuitry 23 is arranged to cause preheating of the heating elements 24 a and 24 b, and thus the portions of aerosol generating material 44 a and 44 b. Suitably, the pre-heat temperature, T_(pre), is set to be lower than a release temperature (T_(rel)) at which the portion of aerosol generating material 44 a or 44 b starts releasing a substantial amount of aerosol. In this way, the aerosol generating material can be warmed but substantially unused during the pre-heat phase.

At time t_(s1), the control circuitry 23 receives signaling from either one or both of the touch-sensitive panel 29 (and more particularly region 29 g of touch-sensitive panel 29) and inhalation sensor 30 signifying a user's intention to inhale aerosol, as discussed above in step S2. In response, the control circuitry 23 is configured to cause the heating elements 24 a and 24 b to be supplied with a level of power corresponding to the heating configuration. In particular, and as shown in FIG. 6 , the control circuitry 23 is configured to cause sufficient power to be supplied to the heating element 24 a to cause the heating element 24 a to reach the target temperature T_(op-low), and the control circuitry 23 is configured to cause sufficient power to be supplied to the heating element 24 b to cause the heating element 24 b to reach the target temperature T_(op-high).

At time t_(f1), the control circuitry 23 determines that the signaling from either one or both of the touch-sensitive panel 29 and inhalation sensor 30 signifying a user's intention to inhale aerosol has stopped or that a predetermined time from receiving the signaling has elapsed, and subsequently causes the power to both heating elements 24 a and 24 b to be dropped to a level that is sufficient to cause the heating elements 24 a and 24 b to reach the target temperature T_(pre).

At a later time, t_(s2), the control circuitry 23 again receives signaling from either one or both of the touch-sensitive panel 29 (and more particularly region 29 g of touch-sensitive panel 29) and inhalation sensor 30 signifying a user's intention to inhale aerosol. In response, the control circuitry 23 is configured to cause the heating elements 24 a and 24 b to be supplied with a level of power corresponding to the heating configuration. In this example, between time t_(f1) and t_(s2), the user has changed the heating configurations such that heating element 24 b is to be supplied with a level of power sufficient to cause the heating element 24 b to reach the target temperature T_(op-low). In particular, and as shown in FIG. 6 , the control circuitry 23 is configured to cause sufficient power to be supplied to both heating elements 24 a and 24 b to cause the heating elements 24 a and 24 b to reach the target temperature T_(op-low).

At time t_(f2), the control circuitry 23 determines that the signaling from either one or both of the touch-sensitive panel 29 and inhalation sensor 30 signifying a user's intention to inhale aerosol has stopped or that a predetermined time from receiving the signaling has elapsed, and subsequently causes the power to both heating elements 24 a and 24 b to be dropped to a level that is sufficient to cause the heating elements 24 a and 24 b to reach the target temperature T_(pre).

This sequence may be repeated until the user switches off the device at time t_(off), at which point the control signal for controlling the power supplied to the heating elements 24 a and 24 b may be stopped.

Although it is shown in FIG. 6 that the target temperatures T_(op-high), T_(op-low), and T_(pre) are set to be the same for each heating element 24, it should be appreciated that the target temperatures may be set differently for different heating elements 24 which correspond to different aerosol generating materials. That is, different aerosol generating materials may have different suitable T_(op-high), T_(op-low) and T_(pre) target temperatures. Equally, the release temperature T_(rel) may also be different for different aerosol generating materials.

As described above, the device 2 according to the described implementations is configured to cause heating of different portions of aerosol generating material, and in particular, the amorphous solids described previously. In particular, the device 2 is configured so as to be able to cause heating of combinations of two of more aerosol generating materials, wherein the device 2 is configured to cause heating of a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material, and configured to cause heating of a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material. The control circuitry 23 is configured to such that heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time.

Substantially the same time here should be understood to mean that the time periods for which the heating occurs have a significant portion that overlap, although the heating time periods may not completely overlap (for example, one heating period may be longer than another).

As described, in some implementations, the aerosol provision device 2 is configured to heat an aerosol generating material comprising an active substance and to heat an aerosol generating material comprising a flavorant. Accordingly, the aerosol delivered to the user in this case comprises both an active (e.g., nicotine) and a flavor.

In some implementations, the aerosol provision device 2 is configured to heat an aerosol generating material comprising an active substance and to heat an aerosol generating material comprising an acid. Accordingly, the aerosol delivered to the user in this case comprises both an active (e.g., nicotine) and an acid. Provision of an acid in the aerosol may protonate some (or all) of the nicotine as the aerosol passes from the receptacle 25 and out of the mouthpiece end 26 of the device.

In some implementations, the device 2 may be configured to prevent aerosolization of the acid rich aerosol generating material if the user has decided not to select the active/nicotine rich aerosol generating material for aerosolization. This is because the primary reason for including an acid may be to cause protonation of the active/nicotine.

In some implementations, the aerosol provision device 2 is configured to heat an aerosol generating material comprising an active substance and to heat an aerosol generating material comprising an aerosol generating agent, such as glycerol. Accordingly, the aerosol delivered to the user in this case comprises both an active (e.g., nicotine) and an additional amount of glycerol. In this case, and as should be realized from the above, some aerosol generating materials may comprise a portion of glycerol in order to generally form an aerosol. However, in the present example, more glycerol can be added to the aerosol that is delivered to the user by heating the portion of aerosol generating material comprising a relatively higher concentration of glycerol. Providing more glycerol may increase the amount of visible aerosol created (e.g., the visible “smoke” that is exhaled by a user).

In some implementations, in some implementations, the aerosol provision device 2 is configured to heat an aerosol generating material comprising a flavorant and to heat an aerosol generating material comprising an aerosol generating agent, such as glycerol. Accordingly, the aerosol delivered to the user in this case comprises both a flavorant and an additional amount of glycerol. In this case, as discussed above, some aerosol generating materials may comprise a portion of glycerol in order to generally form an aerosol. However, in the present example, more glycerol can be added to the aerosol that is delivered to the user by heating the portion of aerosol generating material comprising a relatively higher concentration of glycerol. Providing more glycerol may increase the amount of visible aerosol created (e.g., the visible “smoke” that is exhaled by a user).

In other implementations, the aerosol provision device 2 is configured to heat a third aerosol generating material comprising a third constituent different from the first and second constituents to generate aerosol from the third aerosol generating material, wherein heating the third aerosol generating material occurs at substantially the same time as heating the first and second aerosol generating materials.

In these implementations, the aerosol provision device 2 may be configured to heat an aerosol generating material comprising an active substance, such as nicotine, and to heat an aerosol generating material comprising an aerosol generating agent, such as glycerol, and to heat an aerosol generating material comprising an acid. In this implementation, the user can be provided with protonated nicotine caused by the combination of the nicotine and acid released by the respective portions of aerosol generating material, while the aerosol delivered to the user can also comprise an increased amount of visible vapor.

In other implementations, the aerosol provision device 2 may be configured to heat an aerosol generating material comprising an active substance, such as nicotine, and to heat an aerosol generating material comprising a flavor, and to heat an aerosol generating material comprising an acid. In this implementation, the user can be provided with protonated nicotine caused by the combination of the nicotine and acid released by the respective portions of aerosol generating material, while the aerosol delivered to the user also comprises a flavor.

In yet other implementations, the aerosol provision device 2 is configured to heat a fourth aerosol generating material comprising a fourth constituent different from the first, second, and third constituents to generate aerosol from the fourth aerosol generating material, wherein heating the fourth aerosol generating material occurs at substantially the same time as heating the first, second and third aerosol generating materials.

In such implementations, the aerosol provision device 2 may be configured to heat an aerosol generating material comprising an active substance, such as nicotine, and to heat an aerosol generating material comprising an aerosol generating agent, such as glycerol, and to heat an aerosol generating material comprising an acid, and to heat an aerosol generating material comprising a flavor. In this implementation, the user can be provided with protonated nicotine caused by the combination of the nicotine and acid released by the respective portions of aerosol generating material, while the aerosol delivered to the user can also comprise an increased amount of visible vapor, and contains a flavor.

It should be appreciated from the above that in accordance with the principles of the present disclosure, the user is able to customize the aerosol delivered via the device 2 by selecting certain heating elements, corresponding to certain portions of different aerosol generating material, to activate in response to a user input to generate aerosol. Accordingly, a device 2 and article 4 can be provided which offer greater flexibility to a user without causing changing of the article 4.

It should be understood that the implementations listed above refer to heating between two to four different portions of aerosol generating material at substantially the same time. However, the device is not limited to only heating four different portions of aerosol generating material. For example, the article may comprise six portions of aerosol generating material corresponding to an active rich aerosol generating material, an aerosol generating agent rich aerosol generating material, an acid rich aerosol generating material, and three flavor rich aerosol generating materials, where each flavor is different. The principles of the present disclosure may still be applied for such embodiments, but the device may be configured to heat one, two or three of the flavor rich portions.

In one example, the aerosol generating material comprises or is an amorphous solid. Amorphous solids (e.g., as described above) are particularly suited to being individually heated per inhalation, in part because the amorphous solids are formed from selected ingredients/constituents and so can be engineered such that a relatively high proportion of the mass is the useful (or deliverable) constituents (e.g., nicotine and glycerol, for example). As such, amorphous solids may produce a relatively high proportion of aerosol from a given mass as compared to some other aerosol generating materials (e.g., tobacco), meaning that relatively smaller portions of amorphous solid can output a comparable amount of aerosol.

The amorphous solids may be any of “active substance rich” amorphous solids, the “aerosol generating agent rich” amorphous solids, the “flavorant rich” amorphous solids or “acid rich” amorphous solids descried previously. As described above, different aerosol generating materials may have different T_(op-high) and T_(op-low) temperatures. The table below indicates heating data for the aforementioned amorphous solids, where: T_(op) (range) is the heating range at which the aerosol generating material can be heated to generate sufficient aerosol that is detectable by a human; T_(op-high) (range) is the range of temperatures at which a relatively high volume of aerosol is generated within the T_(op) (range) temperatures; T_(op-low) (range) is the range of temperatures at which a relatively low volume of aerosol is generated within the T_(op) (range) temperatures, and T_(op-low) (specific) and T_(op-high) (specific) are specific exemplary temperature settings for a specific implementation.

T_(op) T_(op-high) T_(op-low) T_(op-high) T_(op-low) Material (range) (range) (range) (specific) (specific) active 140° C. to 190° C. to 140° C. to 200° C. 150° C. substance 220° C. 220° C. 189° C. rich aerosol 170° C. to 200° C. to 170° C. to 200° C. 180° C. generating 230° C. 230° C. 199° C. agent rich flavorant 160° C. to 190° C. to 160° C. to 200° C. 170° C. rich 220° C. 220° C. 189° C. acid rich 160° C. to 190° C. to 160° C. to 200° C. 170° C. 220° C. 220° C. 189° C.

Accordingly, the device 2 is configured to operate within the temperature ranges as set by the above table when heating the aerosol generating material comprising the constituents listed above.

Accordingly, as described in the above, an aerosol provision device 2 can be provided in which a user is able to selectively control which heating elements 24 (and thus which portions of aerosol generating material 44) can be heated in order to provide a customized aerosol to a user. The aerosol generating device is also able to provide an aerosol with different relative amounts of constituent components, thereby offering the user a range of different experiences from a single article 4.

In some implementations, the control circuitry 23 may be configured to generate an alert signal which signifies the end of use of the article 4, for example when each of the heating elements 24 has been activated a predetermined number of times, or when a given heating element 24 has been activated a predetermined number of times and/or for a given cumulative activation time and/or with a given cumulative activation power. In FIG. 1 , the device 2 includes an end of use indicator 31 which in this implementation is an LED. However, in other implementations, the end of use indicator 31 may comprise any mechanism which is capable of supplying an alert signal to a user; that is, the end of use indicator 31 may be an optical element to deliver an optical signal, a sound generator to deliver an aural signal, and/or a vibrator to deliver a haptic signal. In some implementations, the indicator 31 may be combined or otherwise provided by the touch-sensitive panel (e.g., if the touch-sensitive panel includes a display element). The device 2 may prevent subsequent activation of the device 2 when the alert signal is being output. The alert signal may be switched off, and the control circuitry 23 reset, when the user replaces the article 4 and/or switches off the alert signal via a manual means such as a button (not shown).

In more detail, the control circuitry 23 may be configured to count the number of times one or each of the discrete portions of aerosol generating material 44 is heated. For example, the control circuitry 23 may count how many times a nicotine containing portion is heated, and when that reaches a predetermined number, determine an end of life of the article 4. Alternatively, the control circuitry 23 may be configured to separately count for each discrete portion of aerosol generating material 44 when that portion has been heated. Each portion may be attributed with the same or a different predetermined number and when any one of the counts for each of the portions of aerosol generating material reaches the predetermined number, the control circuitry 23 determines an end of life of the article 4.

In either of the implementations, the control circuity 23 may also factor in the length of time the portion of aerosol generating material has been heated for and/or the temperature to which the portion of the aerosol generating material has been heated. In this regard, rather than counting discrete activations, the control circuitry 23 may be configured to calculate a cumulative parameter indicative of the heating conditions experienced by each of the portions of aerosol generating material 44. The parameter may be a cumulative time, for example, whereby the temperature to which the material is used to adjust the length of time added to the cumulative time. For example, a portion heated at 200° C. for three seconds may contribute three seconds to the cumulative time, whereas a portion heated at 250° C. for three seconds may contribute four and a half seconds to the cumulative time.

The above techniques for determining the end of life of the article 4 should not be understood as an exhaustive list of ways of determining the end of life of the article 4, and in fact any other suitable way may be employed in accordance with the principles of the present disclosure.

FIG. 7 is a cross-sectional view through a schematic representation of an aerosol provision system 200 in accordance with another embodiment of the disclosure. The aerosol provision system 200 includes components that are broadly similar to those described in relation to FIG. 1 ; however, the reference numbers have been increased by 200. For efficiency, the components having similar reference numbers should be understood to be broadly the same as their counterparts in FIGS. 1 and 2A to 2C unless otherwise stated.

The aerosol provision device 202 comprises an outer housing 221, a power source 222, control circuitry 223, induction work coils 224 a, a receptacle 225, a mouthpiece end 226, an air inlet 227, an air outlet 228, a touch-sensitive panel 229, an inhalation sensor 230, and an end of use indicator 231.

The aerosol generating article 204 comprises a carrier component 242, aerosol generating material 244, and susceptor elements 244 b, as shown in more detail in FIGS. 8A to 8C. FIG. 8A is a top-down view of the article 4, FIG. 8B is an end-on view along the longitudinal (length) axis of the article 4, and FIG. 8C is a side-on view along the width axis of the article 4.

FIGS. 7 and 8 represent an aerosol provision system 200 which uses induction to heat the aerosol generating material 244 to generate an aerosol for inhalation.

In the described implementation, the aerosol generating component 224 is formed of two parts; namely, induction work coils 224 a which are located in the aerosol provision device 202 and susceptors 224 b which are located in the aerosol generating article 204. Accordingly, in this described implementation, each aerosol generating component 224 comprises elements that are distributed between the aerosol generating article 204 and the aerosol provision device 202.

Induction heating is a process in which an electrically-conductive object, referred to as a susceptor, is heated by penetrating the object with a varying magnetic field. The process is described by Faraday's law of induction and Ohm's law. An induction heater may comprise an electromagnet and a device for passing a varying electrical current, such as an alternating current, through the electromagnet. When the electromagnet and the object to be heated are suitably relatively positioned so that the resultant varying magnetic field produced by the electromagnet penetrates the object, one or more eddy currents are generated inside the object. The object has a resistance to the flow of electrical currents. Therefore, when such eddy currents are generated in the object, their flow against the electrical resistance of the object causes the object to be heated. This process is called Joule, ohmic, or resistive heating.

A susceptor is material that is heatable by penetration with a varying magnetic field, such as an alternating magnetic field. The heating material may be an electrically-conductive material, so that penetration thereof with a varying magnetic field causes induction heating of the heating material. The heating material may be magnetic material, so that penetration thereof with a varying magnetic field causes magnetic hysteresis heating of the heating material. The heating material may be both electrically-conductive and magnetic, so that the heating material is heatable by both heating mechanisms.

Magnetic hysteresis heating is a process in which an object made of a magnetic material is heated by penetrating the object with a varying magnetic field. A magnetic material can be considered to comprise many atomic-scale magnets, or magnetic dipoles. When a magnetic field penetrates such material, the magnetic dipoles align with the magnetic field. Therefore, when a varying magnetic field, such as an alternating magnetic field, for example as produced by an electromagnet, penetrates the magnetic material, the orientation of the magnetic dipoles changes with the varying applied magnetic field. Such magnetic dipole reorientation causes heat to be generated in the magnetic material.

When an object is both electrically-conductive and magnetic, penetrating the object with a varying magnetic field can cause both Joule heating and magnetic hysteresis heating in the object. Moreover, the use of magnetic material can strengthen the magnetic field, which can intensify the Joule heating.

In the described implementation, the susceptors 224 b are formed from an aluminum foil, although it should be appreciated that other metallic and/or electrically conductive materials may be used in other implementations. As seen in FIG. 8 , the carrier component 242 comprises a number of susceptors 224 b which correspond in size and location to the discrete portions of aerosol generating material 244 disposed on the surface of the carrier component 242. That is, the susceptors 224 b have a similar width and length to the discrete portions of aerosol generating material 244.

The susceptors are shown embedded in the carrier component 242. However, in other implementations, the susceptors 224 b may be placed on the surface of the carrier component 242.

The aerosol provision device 202 comprises a plurality of induction work coils 224 a shown schematically in FIG. 7 . The work coils 224 a are shown adjacent the receptacle 225, and are generally flat coils arranged such that the rotational axis about which a given coil is wound extends into the receptacle 225 and is broadly perpendicular to the plane of the carrier component 242 of the article 204. The exact windings are not shown in FIG. 7 and it should be appreciated that any suitable induction coil may be used.

The control circuitry 223 comprises a mechanism to generate an alternating current which is passed to any one or more of the induction coils 224 a. The alternating current generates an alternating magnetic field, as described above, which in turn causes the corresponding susceptor(s) 224 b to heat up. The heat generated by the susceptor(s) 224 b is transferred to the portions of aerosol generating material 244 accordingly.

As described above in relation to FIGS. 1 and 2A to 2C, the control circuitry 223 is configured to supply current to the work coils 224 a in response to receiving signaling from the touch sensitive panel 229 and/or the inhalation sensor 230. Any of the techniques for selecting which heating elements 24 are heated by control circuitry 23 as described previously may analogously be applied to selecting which work coils 224 a are energized (and thus which portions of aerosol generating material 244 are subsequently heated) in response to receiving signaling from the touch sensitive panel 229 and/or the inhalation sensor 230 by control circuitry 223 to generate an aerosol for user inhalation.

Although the above has described an induction heating aerosol provision system where the work coils 224 a and susceptors 224 b are distributed between the article 204 and device 202, an induction heating aerosol provision system may be provided where the work coils 224 a and susceptors 224 b are located solely within the device 202. For example, with reference to FIG. 7 , the susceptors 224 b may be provided above the induction work coils 224 a and arranged such that the susceptors 224 b contact the lower surface of the carrier component 242 (in an analogous way to the aerosol provision system 1 shown in FIG. 1 ).

Thus, FIG. 8 describes a more concrete implementation where induction heating may be used in an aerosol provision device 202 to generate aerosol for user inhalation to which the techniques described in the present disclosure may be applied.

Although the above has described a system in which an array of aerosol generating components 24 (e.g., heater elements) are provided to energize the discrete portions of aerosol generating material, in other implementations, the article 4 and/or an aerosol generating component 24 may be configured to move relative to one another. That is, there may be fewer aerosol generating components 24 than discrete portions of aerosol generating material 44 provided on the carrier component 42 of the article 4, such that relative movement of the article 4 and aerosol generating components 24 is required in order to be able to individually energize each of the discrete portions of aerosol generating material 44. For example, a movable heating element 24 may be provided within the receptacle 25 such that the heating element 24 may move relative to the receptacle 25. In this way, the movable heating element 24 can be translated (e.g., in the width and length directions of the carrier component 42) such that the heating element 24 can be aligned with respective ones of the discrete portions of aerosol generating material 44. This approach may reduce the number of aerosol generating components 42 required while still offering a similar user experience.

Although the above has described implementations where discrete, spatially distinct portions of aerosol generating material 44 are deposited on a carrier component 42, it should be appreciated that in other implementations the aerosol generating material may not be provided in discrete, spatially distinct portions but instead be provided as a continuous sheet of aerosol generating material 44. In these implementations, certain regions of the sheet of aerosol generating material 44 may be selectively heated to generate aerosol in broadly the same manner as described above. However, regardless of whether or not the portions are spatially distinct, the present disclosure described heating (or otherwise aerosolizing) portions of aerosol generating material 44. In particular, a region (corresponding to a portion of aerosol generating material) may be defined on the continuous sheet of aerosol generating material based on the dimensions of the heating element 24 (or more specifically a surface of the heating element 24 designed to increase in temperature). In this regard, the corresponding area of the heating element 24 when projected onto the sheet of aerosol generating material may be considered to define a region or portion of aerosol generating material. In accordance with the present disclosure, each region or portion of aerosol generating material may have a mass no greater than 20 mg; however the total continuous sheet may have a mass which is greater than 20 mg.

Although the above has described implementations where the device 2 can be configured or operated using the touch-sensitive panel 29 mounted on the device 2, the device 2 may instead be configured or controlled remotely. For example, the control circuitry 23 may be provided with a corresponding communication circuitry (e.g., Bluetooth) which enables the control circuitry 23 to communicate with a remote device such as a smartphone. Accordingly, the touch-sensitive panel 29 may, in effect, be implemented using an App or the like running on the smartphone. The smartphone may then transmit user inputs or configurations to the control circuitry 23 and the control circuitry 23 may be configured to operate on the basis of the received inputs or configurations.

Although the above has described implementations in which an aerosol is generated by energizing (e.g., heating) aerosol generating material 44 which is subsequently inhaled by a user, it should be appreciated in some implementations that the generated aerosol may be passed through or over an aerosol modifying component to modify one or more properties of the aerosol before being inhaled by a user. For example, the aerosol provision device 2, 202 may comprise an air permeable insert (not shown) which is inserted in the airflow path downstream of the aerosol generating material 44 (for example, the insert may be positioned in the outlet 28). The insert may include a material which alters any one or more of the flavor, temperature, particle size, nicotine concentration, etc. of the aerosol as it passes through the insert before entering the user's mouth. For example, the insert may include tobacco or treated tobacco. Such systems may be referred to as hybrid systems. The insert may include any suitable aerosol modifying material, which may encompass the aerosol generating materials described above.

Although the above has described implementations in which the aerosol provision device 2 comprises an end of use indicator 31, it should be appreciated that the end of use indicator 31 may be provided by another device remote from the aerosol provision device 2. For example, in some implementations, the control circuitry 23 of the aerosol provision device 2 may comprise a communication mechanism which allows data transfer between the aerosol provision device 2 and a remote device such as a smartphone or smartwatch, for example. In these implementations, when the control circuitry 23 determines that the article 4 has reached its end of use, the control circuitry 23 is configured to transmit a signal to the remote device, and the remote device is configured to generate the alert signal (e.g., using the display of a smartphone). Other remote devices and other mechanisms for generating the alert signal may be used as described above.

In some implementations, the article 4 may comprise an identifier, such as a readable bar code or an RFID tag or the like, and the aerosol provision device 2 comprises a corresponding reader. When the article is inserted into the receptacle 25 of the device 2, the device 2 may be configured to read the identifier on the article 4. The control circuitry 23 may be configured to either recognize the presence of the article 4 (and thus permit heating and/or reset an end of life indicator) or identify the type and/or the location of the portions of the aerosol generating material relative to the article 4. This may affect which portions the control circuitry 23 aerosolizes and/or the way in which the portions are aerosolized, e.g., via adjusting the aerosol generation temperature and/or heating duration. Any suitable technique for recognizing the article 4 may be employed.

In addition, when the portions of aerosol generating material are provided on a carrier component 42, the portions may, in some implementations, include weakened regions, e.g., through holes or areas of relatively thinner aerosol generating material, in a direction approximately perpendicular to the plane of the carrier component 42. This may be the case when the hottest part of the aerosol generating material is the area directly contacting the carrier component (in other words, in scenarios where the heat is applied primarily to the surface of the aerosol generating material that contacts the carrier component 42). Accordingly, the through holes may provide channels for the generated aerosol to escape and be released to the environment/the air flow through the device 2 rather than causing a potential build-up of aerosol between the carrier component 42 and the aerosol generating material 44. Such build-up of aerosol can reduce the heating efficiency of the system as the build-up of aerosol can, in some implementations, cause a lifting of the aerosol generating material from the carrier component 42 thus decreasing the efficiency of the heat transfer to the aerosol generating material. Each portion of aerosol generating material may be provided with one of more weakened regions as appropriate.

Thus, there has been described a method of generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another. The method comprises heating a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material, and heating a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material. Heating of the first aerosol generating material and heating the second aerosol generating material are arranged to occur at substantially the same time. This may provide an aerosol comprising a combination of the aerosols generated from each of the individual portions of aerosol generating material. Also described is an aerosol provision device and an aerosol provision system.

While the above described embodiments have in some respects focused on some specific example aerosol provision systems, it will be appreciated the same principles can be applied for aerosol provision systems using other technologies. That is to say, the specific manner in which various aspects of the aerosol provision system function are not directly relevant to the principles underlying the examples described herein.

In order to address various issues and advance the art, this disclosure shows by way of illustration various embodiments in which the claimed disclosure(s) may be practiced. The advantages and features of the disclosure are of a representative sample of embodiments only, and are not exhaustive and/or exclusive. They are presented only to assist in understanding and to teach the claimed disclosure(s). It is to be understood that advantages, embodiments, examples, functions, features, structures, and/or other aspects of the disclosure are not to be considered limitations on the disclosure as defined by the claims or limitations on equivalents to the claims, and that other embodiments may be utilized and modifications may be made without departing from the scope of the claims. Various embodiments may suitably comprise, consist of, or consist essentially of, various combinations of the disclosed elements, components, features, parts, steps, means, etc. other than those specifically described herein, and it will thus be appreciated that features of the dependent claims may be combined with features of the independent claims in combinations other than those explicitly set out in the claims. The disclosure may include other disclosures not presently claimed, but which may be claimed in future. 

1. A method of generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the method comprising: heating a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material; heating a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material, wherein heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time.
 2. The method of claim 1, wherein the first aerosol generating material is heated to a first temperature at which an aerosol is generated from the first aerosol generating material, and wherein the second aerosol generating material is heated to a second temperature at which aerosol is generated from the second aerosol generating material.
 3. The method of claim 2, wherein the first temperature is selectable from a plurality of temperatures, each temperature arranged to cause the first aerosol generating material to generate different amounts of aerosol.
 4. The method of claim 2, wherein the second temperature is selectable from a plurality of temperatures, each temperature arranged to cause the second aerosol generating material to generate different amounts of aerosol.
 5. The method of claim 1, wherein prior to heating the first and second aerosol generating materials, the method comprises the steps of: selecting a temperature at which to heat the first aerosol generating material; and selecting a temperature at which to heat the second aerosol generating material.
 6. The method of claim 1, wherein the first constituent is an active substance and the second constituent is a flavorant.
 7. The method of claim 6, comprising: heating the first aerosol generating material to a maximum temperature of from about 140° C. to about 220° C., the first aerosol generating material having an active substance content of from 30 to 60 wt % by dry weight of the first aerosol generating material; heating the second aerosol generating material to a maximum temperature of from about 160° C. to about 220° C., the second aerosol generating material having a flavorant content of from 1-60 wt % by dry weight of the aerosol generating material.
 8. The method of claim 1, wherein the first constituent is an active substance and the second constituent is an acid.
 9. The method of claim 8, comprising: heating the first aerosol generating material to a maximum temperature of from about 140° C. to about 220° C., the first aerosol generating material having an active substance content of from 30 to 60 wt % by dry weight of the first aerosol generating material; heating the second aerosol generating material to a maximum temperature of from about 160° C. to about 220° C., the second aerosol generating material having an acid content of from 0.1-8 wt % by dry weight of the second aerosol generating material.
 10. The method of claim 1, wherein the first constituent is an active substance and the second constituent is glycerol.
 11. The method of claim 10, comprising: heating the first aerosol generating material to a maximum temperature of from about 140° C. to about 220° C., the first aerosol generating material having an active substance content of from 30 to 60 wt % by dry weight of the first aerosol generating material; heating the second aerosol generating material to a maximum temperature of from about 170° C. to about 230° C., the second aerosol generating material having a glycerol content of from 5-80 wt % by dry weigh of the second aerosol generating material.
 12. The method of claim 6, wherein the active substance is nicotine.
 13. The method of claim 1, wherein the first constituent is a flavorant and the second constituent is glycerol.
 14. The method of claim 13, comprising: heating the first aerosol generating material to a maximum temperature of from about 160° C. to about 220° C., the first aerosol generating material having a flavorant content of from 5-60 wt % by dry weight of the first aerosol generating material; heating the second aerosol generating material to a maximum temperature of from about 170° C. to about 230° C., the second aerosol generating material having a glycerol content of from 5-80 wt % by dry weigh of the aerosol generating material.
 15. The method of claim 1, further comprising heating a third aerosol generating material comprising a third constituent different from the first and second constituents to generate aerosol from the third aerosol generating material, wherein heating the third aerosol generating material occurs at substantially the same time as heating the first and second aerosol generating materials.
 16. The method of claim 6, further comprising heating a third aerosol generating material comprising a third constituent different from the first and second constituents to generate aerosol from the third aerosol generating material, wherein heating the third aerosol generating material occurs at substantially the same time as heating the first and second aerosol generating material, wherein the third constituent is glycerol.
 17. The method of claim 16, further comprising heating the third aerosol generating material to a maximum temperature of from about 170° C. to about 230° C., the third aerosol generating material having a glycerol content of from 5 to 80 wt % by dry weight of the third aerosol generating material.
 18. The method of claim 15, further comprising heating a fourth aerosol generating material comprising a fourth constituent different from the first, second and third constituents to generate aerosol from the fourth aerosol generating material, wherein heating the fourth aerosol generating material occurs at substantially the same time as heating the first, second and third aerosol generating materials.
 19. The method of claim 6, further comprising heating a third aerosol generating material comprising a third constituent different from the first and second constituents to generate aerosol from the third aerosol generating material, and a fourth aerosol generating material comprising a fourth constituent different from the first, second and third constituents to generate aerosol from the fourth aerosol generating material, wherein heating the third and fourth aerosol generating materials occur at substantially the same time as heating the first and second aerosol generating materials, the method further comprising: heating the third aerosol generating material to a maximum temperature of from about 160° C. to about 220° C., the third aerosol generating material having an acid content of from 0.1-8 wt % by dry weight of the third aerosol generating material; and heating the fourth aerosol generating material to a maximum temperature of from about 170° C. to about 230° C., the fourth aerosol generating material having a glycerol content of from 5 to 80 wt % by dry weight of the fourth aerosol generating material.
 20. The method of claim 1, wherein the aerosol generating material is an amorphous solid.
 21. The method of claim 1, wherein the method includes heating any one or more of the portions of aerosol generating material to a maximum temperature below a temperature sufficient to generate aerosol from the respective portion of aerosol generating material, before heating the portion of aerosol generating material to a maximum temperature to generate aerosol from the portion of aerosol generating material.
 22. An aerosol provision device for generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the device comprising: a plurality of heating elements; and control circuitry configured to implement the method of claim
 1. 23. An aerosol generating system comprising an aerosol generating device according to claim 22, and an aerosol generating article comprising a first aerosol generating material comprising a first constituent and a second aerosol generating material comprising a second constituent.
 24. An aerosol provision means for generating aerosol from an aerosol generating article which comprises portions of aerosol generating material having different compositions from one another, the means comprising: a plurality of heating means; and control means configured to: cause heating of a first aerosol generating material comprising a first constituent to generate aerosol from the first aerosol generating material; cause heating of a second aerosol generating material comprising a second constituent different from the first constituent to generate aerosol from the second aerosol generating material, wherein heating the first aerosol generating material and heating the second aerosol generating material occurs at substantially the same time. 